Machine tool



March 19, 1935. o. TWEIT 1,994,879

MACHINE TOOL Filed March 16, 1933 INVENTOR aw M Patented Mar. 19, 1935 I 1,994,879

' UNITED STATES PATENT OFFICE 1,994,s7e y I V 7 MACHINE. 'rooL' Olav Tweit, West Orange, N. J. Application Mi 16, 1933, Serial N6. 661,026 7 Claims. (c1. 82 -2) g This invention relates to. machine tools, and gears'2, one of which is on. the armature shaft more particularly, to machine tools adapted to of the 'motor' and the other is keyed to shaft 4. be moved in a circular direction to bore,.plane, or Integral with, or rotatably secured to, shaft; otherwise machine .the work, as for example mais a shaft 8 having secured thereto, as for exam- 5 chine tools employed tdmachine the end faces ple by. heing'keyed thereon and bolted thereto 5 of the hubs. of propellers, flanges on pipes, etc. as indicated bythe reference numeral 9', a tool 7 Such work, because of its size and shape, is usuhousing 9. "A..toolholder .10, having detachably ally maintained fixed and the machine tool romounted thereimas for example by a bolt 10, a

' tated with; respect thereto toolxl'liis mounted, for reciprocating motion, on

10 In the machine tools heretofore customarily the threaded shaft 14 which passes through a '10 employed, when it was desired to alter the posithreaded opening in holder 10'. Holder 10 is tion of the rotating tool, it was: necessary to stop formedas shown in 3' with extending portions the machine tool and make the desired adjust-- 12 forming a rabbeted. joint 13 with the exment in the position of the tool. 1 tending arms 13? of the tool housing 9. The tool 15 It is an object ofithisinvention to provide a I]; in the embodiment of the invention shown'on 1'5 machine tool, the tool of which maybe rotated the. drawing is a planing toolarranged to engage at a relatively rapid rate to describe circles and the endface of thehub of the work' 11 fixed on simultaneously moved radially; that is to say, the, support 12.- Shaft 14 is rotatably mounted the machine tool of this invention may bemoved in'bearings 15, 16in the tool housing 9 and has to describe circles and during the: circular movekeyed thereon atthebaseportion thereofa gear 20 ment, without. stopping or slowing up the ma 17'. Rotation of this gear causes rotation of the chine, may be automatically moved linearly; shaft 14 with consequent -.movement of the tool-- In the preferred.embodimentillustratedon the holder 10, either I upwardly or downwardly, de-

drawing, the invention shown incorporated in pending upon whether the shaft 14' is rotated in a machine t'oolfor finishingthei surface of the clockwise. or counterclockwise direction. 25

work, as, for example, the hub of a propeller; and Ahub gear 18-is loosely mounted on shaft 8 and the present description will be confined to the has teeth at. the periphery thereof arranged to present illustrated embodiment of the invention. mesh with the teeth. on gear l'l; -Keyed to the It will be understood, however, that'the novel end, of gear l8,remoteirom' the teeth, is. a. gear features and improvements are susceptible to 19'. A cover plate 2l,.providing a bearing sup- 30 other applications, such, for example, as multiple port for shaft 8,;is fixed to the; standard 6, as machining, i. e.,. boring orgrinding aplural-ity of ior example by-bolts25. A second plate 22' secylinders ina motor. .Hence, the soopeof this cured to plate. -21bybolts 23formsa casing 24 invention is not confined to-the embodiment herefor the transmission hereinafter described. in escribed- Y ..-This transmission is'compo'sed of two ring 35 Other objects and advantageswill appear from gears 26 and 27,'gear. 2.6 beingfix'ed to-plate 21, the following detailed. description, taken in connas-for example ,by bolts- 281andgear 27 being necticn with they accompanying drawing, in rotatablymountedin the casing24. Gear 27 has which-. secured thereto by bolts 30 a ringgear 29;rotat- Fig. 1 is a vertical section, partly in. elevation, ably disposed in a inachinedchannel 29. Ring 40 of a machine tool embodying this invention tak gears 26 and 27 are of the samesize. A gear 20 en in a plane passingthrcugh line l' of Fig- 2'; is keyed to shaft 8 and has its teethfacing the Fig. 2 is a vertical section, partly in elevation, teeth onring gear 26.. The teeth of ring gear of the machine of Fig. ltaken in .a. plane pass- 27', it will be noted, face the teeth.of gear 19. ing through line 22*of Fig. v1; and A holder 37 is' rotatably mounted on the'shaft 45 Fig. 3 is a horizontal section, partly in eleva- 8 and has fixed thereimasffor example by pin 40, tion, of the tool holder shown in Fig. 2,, this -figa stub shaft 39. 'Rotatably mounted on one end ure being taken in a plane passing through line of the stub shaft is a pinion 43 having its teeth 3-3 of Fig. 1 a 1 a meshing with the teeth of ring gear 26 and gear Referring t0 the drawing, reference ume al 20. 'A secondpinion 38 is rotatably mounted on 50 4 indicates a shaft r'otatably mounted. in bearthe other-end of the stub shaft 39 and has its iIlgS 5 integral With a Standard p-P 6 havteeth meshing with the teeth of the ring gear 2'! ing legs '7. Shaft 4 may be rotated by an elecan'dgear 19".- Nuts and washers 41- maintain the trio motor or other power plant 3, which may be pinions 38 and 43 .on the stub shaft 39. A shaft indriving connection with shaft 4 by means of 32 is rotatahly mounte'd in the bearing support 55 32' of plate 21. Collar. 35 on shaft 32 prevents lateral movement of this shaft toward the right viewing Fig. 1. This shaft has keyed at one end thereof a pinion 31 arranged to mesh with ring gear 29 to rotate this gear. A nut 34 maintains the pinion 31 on shaft 32. A hand wheel 36 is secured to the shaft 32 to rotate it manually during the rotation of the tool 11. Shaft 32 is also provided with a gear 51 keyed thereon and arranged to mesh with gear 52 driven through reduction gearing indicated generally by the reference numeral 53. The reducing gearing 53 may be driven by motor 3 when it is desired to continuously move the tool 11 linearly; otherwise, the power connection between the motor 3 and wheel 36.

In operation, shaft 8, with toolhousing 9, is rotated by the rotation of shaft 4 driven by motor 3 so that toolholder 10 with the tool 11 describes circles.

Gear 20 rotates withshaft 8 .and the pinion 43 meshing with gear 20 and the fixed ring gear 26 will therefore be caused to roll in a planetary motion around shaft 8. Pinion 38,

a it will be noted, has its axis in a. fixed relation with that of pinion 43, and consequently, it will be rotated bodily about'the axis of shaft 8. Pinion 43 meshes with ring gear 27 and gear 19 and it will therefore roll between these gears. When ring gear 27 is kept fixed, the pinion 38-.will rotate about stub shaft 39 as an axis and'will'rotate the gear 19 at a speed equal to that of gear 20. Consequently, the shaft 8 and the hub gear 18 will rotate at the same speed so that there will be no relative movement between these two members. Hence gear 17 and threaded shaft 14 will not be rotated and the screw 14 and toolholder 10 will during the rotation of shaft 8 remain in a fixed position. When it is desired to alter the position of the tool during therotation of shaft 8, hand wheel 36 is turned, rotating pinion 31 meshing with ring gear 29, causing rotation of ring gear-27 bolted to gear 29. This will ac-v celerate or deaccelerate the rotary speed of pinion 38, depending upon the direction of rotation of gear'29. Since the planetary speed of pinion 38 is fixed with relation to the speed 'of rotation of shaft 8, the motion imparted to ring gear 27 will be transmitted to gears 19 and 18, causing an acceleration or deacceleration of these gears in relation to the speed of shaft 8. The movement thus impartedto hub gear 18 will be transmitted through gear 17 to threaded shaft 14, causing the toolholder 10 to move during its circular movements. v

If instead of manually moving shaft 35,'this shaft were driven through reduction gearing 53, the tool 11 would be'moved continuously in a radial direction during'the circular motion of tool ll so that the work would be machined from end to end thereof. f 7

While preferred embodiments of this invention have been shown and described, itv will be understood that various changes may bemade by those skilled in the art without departing from this invention. For example, the toolholder may be moved longitudinally to the axis of-shaft 8 or at an angle other than a right angle by changing the gears 17 and 18 or instead of screw shaft 14,

linearly gears may be employed to impartlinear movement to the tool 11. The invention, therefore; is not to be limited to the disclosure herein but only by the scope of the appended'claims.

What is'claimed is:

1. In amachine tool, in combination, a rotating shaft, a toolholder fixed to said shaft and rotatable therewith, a threaded shaft rotatably mounted in said toolholder, a tool carried by said threaded shaft and arranged to be moved in a linear direction upon rotary movement of said threaded shaft, a gear fixed to said threaded shaft, a second gear rotatably mounted on said shaft and meshing with the. first-mentioned gear, a third gear keyed to said shaft, a fixed ring gear having its teeth disposed facing the teeth on said third gear and spaced therefrom, a holder on said shaft, a pinion meshing with said third gear and fixed ring gear rotatably mounted on said holder,

I a second pinion carried by said holder and in driving engagement with said second gear, a second ring gear arranged to mesh with said second pinion; and means for moving said second ring gear.

; ,2. Ina machinetool, in combination, a rotatable tool, andmeans for rotating said tool and simultaneously moving said tool in a linear direction, .said means comprising a rotating shaft, 2. pair of gears on said shaft, a pair of .ring gears having their teeth facingthe teeth on said firstmentioned pairof gears,,a pair of'pinions disposed with their teeth meshing with both the ring gears and the first-mentioned gears, one of 'saidring gears being fixed and-the other being movable.

3. A transmission for imparting both circular and linear motion comprising a rotating shaft, a pair of gears onsaid shaft, a pair of ring gears having their teethtfacing the teeth on said firstmentioned pair of gears, a pair of pinions disposed with their teeth meshing with both the ring gears and the first-mentioned gears, one of said ring gears being fixed and the other being movable.

4. A transmission for imparting both circular and linear motioncomprising a rotating shaft, a pairof gears on said shaft, a pair of ring gears having their teeth facing the teeth onsaid firstmentioned pair of gears, a pair of pinions disposed with their teeth meshing with both the ring gears and the first-mentioned gears, one of said ring gearsbeing fixed and the other being movable, and means for rotating said movable gear.

e 5'. In a machine tool, in combination, a rotating shaft, a toolholder fixed to said shaft and rotatable therewith, a threaded shaft rotatably mounted in said toolholder, a tool carriedby said threaded shaft'and arranged to be moved-in a linear direction upon rotary-movement of said threaded shaft, a gear fixed to said threaded shaft, a second gear. rotatably mounted on said first-mentioned shaft and meshing with the first-mentioned gear, a fixed casing through which saidrotating shaft extends, a ring gear fixed to said casing, a gear keyed to the first-mentioned shaft and'having its teeth fa'cing'the teethof said ring gear, a holder rotatably mounted on said rotating shaft, a stub shaft carried by said holder, a pinion rotatably mounted on said stub shaft and having its teeth meshing with the teeth of said ring gear and the gear keyed to said rotating shaft, another gear fixed to said second-mentioned gear, a second pinion rotatably mountedonsaid stub shaft and meshing with the gear fixed to said secondmentioned gear, a second ring gear having its teeth facing the teeth on the gear fixed to said second-mentioned gear, said second ring gear meshing with said second pinion, and means for rotating said second ring gear.

OLAV TWEIT. 

